Help me pls this is overdue and I am so confused cause the teacher didn't cover it long enough for me to understand. Please answer the question and possibly maybe explain it to me if you can.

Adiver in midair has an angular velocity of 6.0 rad/s and a moment of inertia of 1.2 kg·m2. he then pulls is arms and legs into a tuck position and his angular velocity increases to 12 rad/s. the net external torque acting on the diver is zero. what is his moment of inertia in the tuck position?

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

It is really hard for me right know